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charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit Hello, kernel test robot noticed a 95.7% regression of stress-ng.seccomp.ops_per_sec on: commit: a3af84b0fa00ead01fcd0e28b5d773ff25990a0d ("x86/bugs: Enable IBPB flush on BPF JIT allocation") https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git master testcase: stress-ng config: x86_64-rhel-9.4 compiler: gcc-14 test machine: 256 threads 2 sockets Intel(R) Xeon(R) 6768P CPU @ 2.4GHz (Granite Rapids) with 64G memory parameters: nr_threads: 100% testtime: 60s test: seccomp cpufreq_governor: performance If you fix the issue in a separate patch/commit (i.e. not just a new version of the same patch/commit), kindly add following tags | Reported-by: kernel test robot | Closes: https://lore.kernel.org/oe-lkp/202608191340.98574fe2-lkp@intel.com Details are as below: --------------------------------------------------------------------------------------------------> The kernel config and materials to reproduce are available at: https://download.01.org/0day-ci/archive/20260819/202608191340.98574fe2-lkp@intel.com ========================================================================================= compiler/cpufreq_governor/kconfig/nr_threads/rootfs/tbox_group/test/testcase/testtime: gcc-14/performance/x86_64-rhel-9.4/100%/debian-13-x86_64-20250902.cgz/lkp-gnr-2sp4/seccomp/stress-ng/60s commit: 96cce16e26 ("bpf: Support for hardening against JIT spraying") a3af84b0fa ("x86/bugs: Enable IBPB flush on BPF JIT allocation") b72e29e0f7 (bpf: Prefer dirty packs for eBPF allocations) 96cce16e26dd02a8 a3af84b0fa00ead01fcd0e28b5d b72e29e0f7ee329d89f86db8700 ---------------- --------------------------- --------------------------- %stddev %change %stddev %change %stddev \ | \ | \ 351130 -95.7% 15233 -92.8% 25169 stress-ng.seccomp.ops 5866 -95.7% 252.80 -92.9% 418.07 stress-ng.seccomp.ops_per_sec 403577 -92.1% 31710 -88.5% 46510 stress-ng.time.involuntary_context_switches 34288719 ± 2% -95.4% 1594121 -92.5% 2566499 stress-ng.time.minor_page_faults 4244 -67.9% 1363 ± 2% -71.9% 1193 stress-ng.time.percent_of_cpu_this_job_got 2515 -67.1% 826.95 ± 2% -71.3% 721.20 stress-ng.time.system_time 41.17 ± 2% -94.9% 2.10 ± 3% -91.7% 3.40 ± 2% stress-ng.time.user_time 1119583 ± 2% -96.3% 40891 -94.5% 61287 stress-ng.time.voluntary_context_switches Commit b72e29e0f7 slightly recovers performance but remains far below baseline. Disclaimer: Results have been estimated based on internal Intel analysis and are provided for informational purposes only. Any difference in system hardware or software design or configuration may affect actual performance. -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki